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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Formin-2, polyploidy, hypofertility and positioning of the meiotic spindle in mouse oocytes.

Successful reproduction in mammals requires a competent egg, which is formed during meiosis through two assymetrical cell divisions. Here, we show that a recently identified formin homology (FH) gene, formin-2 (Fmn2), is a maternal-effect gene that is expressed in oocytes and is required for progression through metaphase of meiosis I. Fmn2(-/-) oocytes cannot correctly position the metaphase spindle during meiosis I and form the first polar body. We demonstrate that Fmn2 is required for microtubule-independent chromatin positioning during metaphase I. Fertilization of Fmn2(-/-) oocytes results in polyploid embryo formation, recurrent pregnancy loss and sub-fertility in Fmn2(-/-) females. Injection of Fmn2 mRNA into Fmn2-deficient oocytes rescues the metaphase I block. Given that errors in meiotic maturation result in severe birth defects and are the most common cause of chromosomal aneuploidy and pregnancy loss in humans, studies of Fmn2 may provide a better understanding of infertility and birth defects.[1]


  1. Formin-2, polyploidy, hypofertility and positioning of the meiotic spindle in mouse oocytes. Leader, B., Lim, H., Carabatsos, M.J., Harrington, A., Ecsedy, J., Pellman, D., Maas, R., Leder, P. Nat. Cell Biol. (2002) [Pubmed]
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